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 learningmplus posted on Tuesday, October 15, 2013 - 9:43 am
Hi!

I would like to ask for help with running LPA. I am trying to run the syntax below but I get an error. When I include
file is JADP.dat to upload the data, I get an error that the file does not exist.

When I try to load the data with
file is "C:\Users\LM\Desktop\LPA.dat";
it tells me that the program cannot run a multiple group analysis with mixture command.

What I would like to do is to correct the syntax below and get it to work. I would appreciate your help in correcting the syntax.

Thank you!


title:
2-Class Latent Profile Analysis
of Peer Nominations Wave 2 Data;
data:
file is JADP.dat;
file is "C:\Users\LM\Desktop\LPA.dat";
variable:
names=x1-x10;
classes=c(2);
analysis:
type=mixture;
PLOT:
TYPE=PLOT3;
SERIES IS x1(1) x2(2) x3(3) x4(4) x5(5) x6(6) x7(7) X8(8) x9(9) x10 (10);
model:
OUTPUT:
TECH1 TECH5 TECH10;
SAVEDATA:
FILE IS myfile2c.dat;
SAVE = CPROBABILITIES;
 Linda K. Muthen posted on Tuesday, October 15, 2013 - 10:43 am
What is the name of the data file? Is it jadp.dat or lpa.dat?
 learningmplus posted on Tuesday, October 15, 2013 - 10:56 am
It is LPA.dat
I just realized the use of both names.

Now, I tried to run it based on the lpa.dat which I saved on my desktop. It is still not working. How can I fix it?

** ERROR in DATA command
The file specified for the FILE option cannot be found. Check that this
file exists: LPA.dat


title:
2-Class Latent Profile Analysis
of Peer Nominations Wave 2 REAL Data;
data: file is LPA.dat;
variable:
names=x1-x10;
classes=c(2);
analysis:
type=mixture;
PLOT:
TYPE=PLOT3;
SERIES IS x1(1) x2(2) x3(3) x4(4) x5(5) x6(6) x7(7) X8(8) x9(9) x10 (10);
model:
OUTPUT:
TECH1 TECH5 TECH10;
PLOT:
TYPE=PLOT3;
SERIES IS x1(1) x2(2) x3(3) x4(4) x5(5) x6(6) x7(7) X8(8) x9(9) x10 (10);
SAVEDATA:
FILE IS myfile2c.dat;
SAVE = CPROBABILITIES;
 Linda K. Muthen posted on Tuesday, October 15, 2013 - 11:31 am
Search your hard drive for lap.dat to be sure it does not have another extension. If it is not in the directory you are running from, use the full path name.
 Jessica Clement posted on Wednesday, March 16, 2016 - 9:03 am
Hello,

I am new to Mplus and after spending quite some time reading the user guide (v.7) and various papers, I'm left with some basic questions about model specification.

I have seen some examples where the model is specified as:

MODEL:
%OVERALL%
%c#1%
[y1y4*1];
y1-y4;
%c#2%
[y1y4*-1];
y1-y4;

(from example 7.10 in user guide)

and

MODEL:
%OVERALL%

and other examples with no model specified in the input.
(And, of course, other specifications, but let's start here.)

1) I saw from the user guide what this syntax stands for, but I don't see in the guide the interpretation or the goal of this syntax. Can you please indicate a resource that explains how to choose the syntax for the goals of your research?

2) From example 7.10, I don't see how to scale this syntax to different class sizes, like 3 or 4 classes.

If it helps, I wish to do LPA with 6 continuous dependent variables for 3 or 4 classes (to be determined), and eventually use 2 covariates.

Thank you very much for your help.

Best,

Jessica
 Linda K. Muthen posted on Wednesday, March 16, 2016 - 2:59 pm
The type of analysis you want to do determines how to create an input file. If you want to do LPA, follow Example 7.9. LPA is LCA with continuous latent class indicators. The CLASSES option is used to change the number of classes. The number in parentheses refers to the number of classes.

We have several courses available on the website. Topic 5 is an introduction to mixture modeling.
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